Should you open the windows or not?
Will opening the windows help reduce the humidity in my home today?
Heating the air from outside reduces its relative humidity, what is the resulting humidity?
When the outside humidity is very high most would assume that opening the window will not help to reduce the humidity inside your home. Humidity is affected by temperature. As the temperature of the air rises, the relative humidity falls. So if you open your window the cold humid air from outside will enter inside, but when it comes back up to temperature it may be less humid than the air was inside.
Try to keep inside humidity in the range of 40-60%.
The following calculator will work out the humidity of the outside air when it has been warmed up to the temperature of your home: